Approximately 90% of price action occurs between the two bands. Any breakout above or below the bands is a major event. The breakout is not a trading signal. The mistake most people make is believing that that price hitting or exceeding one of the bands is a signal to buy or sell. Breakouts provide no clue as to the direction and extent of future price movement.
Fra investopedia om bollinger bonds.
Fremholder at det er betydelig høyere oppside enn nedside i caset, og trading således frarådes.